Plastering machine



May 4,1926. 7 1,583,283

. T. C. DUNLAP 3 PLASTERING MACHINE.

Filed Nov 22 1 I 3 sheetssheet l- T. C. DUNLAP PLASTERING MACHINE Filed Nov. 22 1924 3 Sheets-Sheet 2 THADDEUS IC.DUNLAP Patented May 4 1926.

' UNITED srares rar snrfiorrion jrnannnus ocDU nLAP, or ooLUivrBUs, oHI'o.

rnas'rnnrne M CH-Innv Application filed November 22, 1924. Serial No. 751,662.

1 call whom'z't may concern:

Be it known that I, Ti-nmnnus C. DUNLAI, I

a citizen of the United States. residing at Columbus, in the county of Franklin and 7 State of Ohio, have invented a certain new.

and useful Improvement in Plastering Machines, of which the following is a specifica- L' tion.

As far as I am aware there has heretofore been no attempt to devise-a machine adapted to apply plaster,- especially ordinary brown coat in a manner simulating that commonly practiced by the human hand. Sucha machine to be successful must be adapted to work .in rooms of various sizes and on walls of different heights and w dths and yet it must be adapted to be readily passed through ordinary doorways; further in order that the machine shall woi k'rapidly it should be adapted to plaster large areas and lying in diflerent planes without numerous shiftings; and finally the machine should be adapted to be managed with little skilled labor'l or the expenditure of much power. The object of my present invention is to provide such a machine.

The invention is embodied in the example herein shown and described. It maybe stated generally that with this machine the 30 over the lath and to shiftthe applicator horizontally between the limits of vertical applications to apply fresh ribbons in the development of the plane to be plastered. The machine also includes means whereby the width of the ribbon of plaster can be varied so as to cover narrow strips such'for example as may be left uncoverednear corners in the room in the regular operationfof the machine or upon I narrow projections from or recesses'in the'wall. In such a machine it will therefore be important that the mechanism shall be adapted to shift the applicator in 'a right line with reference to a point of oscillation of its carrierin order to apply successive: verticals ribbons of zthe 'structure is pivoted at-it's iniddle 'by' a king 'pi-n at *21 u ona.. large gear '22- so as plaster. V

In the accompanying drawings 3 Figure 1 is. a View in side elevationfwith some parts broken out, theba'se being in'end 1 -V1F3W. y

. h Fig. 2 is a combined "Seoti0rL-1and*-e1evation looking toward the-left from the line H, ig. 1. g

F 1g; 3 is atop plan view of the upper portion of the machine.

Fig. 4 1s a top plan-view of the lower portion or base of the machine.

Fig. 5 is a side View of the base of machine.

the

Fig. 6 is a vertical'sectional view'through the center of theibase,.the saddle and superrmposed "parts of the base.

Fig. 7 isa detail sectional View showing the mounting of the forward endof the hopper and operating ge'aringr V s Fig. 8 is a detail in plan View of the hopper controlling cam guide.

F 1g. 9 is a diagrammatic View illustrating v the principle of operation of themeans for horizontally shifting the plaster applicator in "a straight line.;

'Fig. 10' is a detail in planviewon asinaller scale of" the applicator lazy-tongs.

'In the several views 11 designates the plaster applicator having a long narrow mouth from'which the plaster is forced in ribbon? 'forinfThe applicator is supplied with plaster through a neck 12 from a hopper 13 having at its bottom a chamber containing a feed screw 14: turned by an electric motor 15 mounted on-the screw chamber and transn'iitting power to the feed screw shaft through aspr'ocket chain 16 and gears 17 and 18. The applicator isswivelly connectedwith said downwardly extended. forward end of'thescrew chamber and on the neck of the applicator 1S1110l111tGCl a worm gear 11 engaged by a worn'i 1 1": driven by anelectric motor'll As the applicator is' m0ved vertically toapply plaster the changeability ofits singularity permits variation in te'r to be applied. Theforward end of the hopper is pivotally supported 'on a pin 19 a) be capable at both' end's To obtain 21 or. expanding and contracting ith reference to said kingpin. dity and snength of the "lazythe horizontal width of the ribbon of plastongs their Tiara tra nees vertioallyideep 5'33 and and some of them are bent, as at at the region where they cross each other, as best shown in Fig. 10 so as to permit a shortened vertical hinging connection at their meeting ends. V

Pivoted on the king pin 21 is a bar or platform 28 carrying a horizontally arranged worm gear 2% having a vertical shaft provided with a pinion 25 engaging the large spur gear 22 said worm gear being engaged and driven as desired by a worm 26 on the shaft of an electric motor 27 also mounted on the platform 23. The shaft 27 is journaled in bearings 26 on posts 26 on the platform. The rearmost connecting pin of the lazytongs is equipped with a suitable head to engage a slot extension 23 of the platform 23 so as to permit elongation and contraction of the lazy-tongs when the platform is the trat dia aid. diagram F g: 9v

oscillated by reason of the revolution of the pinion 25 around an arc of the large gear 22.

Pivotally connected at their out-er ends with the forward lateral hinging members of the lazy-tongs 20 are two channel members 28 formed to develop a straight line motion of the applicator, said members 28 being hingedly connected together at their inner ends and engaged by a rollered pin 29 fixed on t ie lower side of the hopper. These members 28 cause the expansion or contraction of the lazy-tongs as they are swung by gears 2A 22.

On the hopper pivoting'pin 19 is keyed asuitable spur gear 30 engaged by a suitable spur gear 31 fixed to the bottom of the hopper so that as the lazy-tongs are shifted to the right or left angularly with-reference to a medial or setting up line the hopper is continually shifted to maintain position parallel to said medial line position. When at said medial position the medial line bisects the angle included by the arms of the lazytongs pivoted on pin 19, said angle then being 120 degrees. hen, therefore, the lazy tongs 2O lies in the medial position with the applicator parallel to wall to be plastered and thepinion 25 is operated to swing the lazy-tongs, said tongs are gradually extended, the mouth of the applicator being mean while maintained. in a position parallel to *all to be plastered. This movement is illustrated in the diagram Fig. 9 where the full line position indicates the medial or setting up position and the broken lines the extreme position to the left. It will be noted from this diagram and the construction described that the members 28 cooperate in maintaining the hopper in right angled position with respect to the wall to be plastered, and in maintaining this position they cause the lazy-tongs to expand or contract to effect a straight line movement of the applicator parallel to the wall to beplastered when the lazy-tongs are swung horizontally as illus- As the applicator is to be moved up and down to apply the plaster the gear 22 is supported upon mechanism for raising and lowering the horizontal lazy-tongs and its appurtenances. Said mechanism includes an open truck frame of oblong form having a rack 32 along the inner wall of one of its longer sides. This truck frame 32 is supported by means of four rather long wheel-carrying arms 33 hinged to brackets 31 fixed at each of the four corners of the frame by means of manually operated screws 35 said screws being adapted to pinch the arms 33 to the brackets and thus fix them in theposition to which adjusted. To prevent the truck from fortuitously moving about on the floor the said arms 33 are provided with pointed hand operated leveling screws 86 adapted to engage the floor and, if necessary, to constitute the supports for the truck and machine in lieu of the Wheels when the machine is being operated. Because the arms 33 are hinged as shown they can be folded toward the sides of the frame and thus permit the machine, after its superstructure has been sufficiently depressed, to be moved through the ordinary doorway.

Slidingly mounted on the truck frame 32 is a saddle 37 carrying a slide38 tongued thereto and on the latter a rotary, plate or turn table formed asv a large worm gear 39. The worm 39 is engaged by a worm .0 journaled in suitable hearings on the slide 38, said worm being operated by a suitable crank wrench applied to the squared end of the worm gear shaft, as shown. The saddle 37 is moved longitudinally in the truck frame by.means of a pinion 37* operated by a hand wrench applied to the shaft of the pinion for the purpose of increasing the area of wall to which plaster can be applied with one setting of the machine, while-ad justmentof the slide 38 and worm gear 89 are for the purpose of properly determining the plane of operation of the applicator. Mounted on the slide 38 is a triangular frame i1 upon each of the three upper sides of which is journaled a pair of right and left'screws 4-24E3 having at their adjacent ends bevel gears 4i4;5, and upon each of the screws traveling in a dovetail groove, as shown, are nuts 4-6-47 to which are connected the pivots of the lowermost joints of a set 63 of vertically extending lazy-tongs. The lower end of each of these lazy-tongs is thus hingedly connected with the worm gear while the upper end is similarly connected with the lower side .of the large spur gear 22. To stiffen the three lazy-tongs structures they are connected at corresponding crossings by circular rings 48, as shown. To open and close theselazy-tongs structures and therefore raise and lower respectively the gear 22, and the parts the latter carries,

the. bevolgealfsiid5 areeach engaged by an intermediate bevel gear 49 o-n'radially extending shafts 50 each having mitre gears 51 engaged with one another, one of said shafts 50 having an extension 52 extending into an ordinary worm gear box containing a worm driven by a worm shaft 5% that in turn is driven by an electric motor 55 mounted on an extension of the triangular base ll.

The saddle is adjustable in the frame 31 by means of a pinion 3T engaging the rack 32 of the frame 32 to shift the plaster ing apparatus from one plastering position to the next. The pinion 37 can be turned in either direction by applying a hand operated wrench to the squared end, as shown, of the shaft of said pinion.-

To insure a clear and uniform discharge of the ribbon of plaster the mouth. of the applicator is equipped longitudinally and ex" ternally with a perforated traveling slide 57 engaged by one arm 58 of a bell cranl' lever connected with the external end of a normally vertical shaft 59, the other arm 01 said lever being mounted on said shaft within the interior of the applicator body and actuated by a rod 60 extending rearward to a cam member 61 mountedonthe shaft of the feed screw 14:. The rear'end'ot the rod 60 is bent inwardly, as shown, toengage a groove of said cam member 61 so that as the feed screw 14 is turned the traveling slide 57 is reciprocated. The connection of the rod 60 with the internal arm of the bell crank lever should be of the swivel or ball and socket variety with its axis coinciding with the axis of the swinging movement of the swiveled applicator before described.

All of the worms and worm gears herein referred to are of the irreversible type so that when lel't after turning to the position desired the parts thereby operated are locked from accidental movement.

The planes or walls to be developed by the mortar are determined by dropping plumb lines at the ends of the planes or walls, the machine being leveled and adjusted tobring the cross-hairs of a binocular sight .62 into coincidence with the plumb line thereby bringing the machine into proper position to develop the walls. Said sight 62 is mounted on a bracket on the neck of the hopper.

Suitable electric circuits with appropriate switches, not shown but well understood, are provided for independently operating the electric motors.

in practice the plaster, upon the operation. of the feed screw by motor 15 and the vertical lazy-tongs, will emerge from the nozzle well agitated and compressed in ribbon form and laid upon the wall to the proper thickness and plane by the ironing or trowelling shoes of the nozzle, the vertical movement up and down being effected by operating the motor In plastering a vertical wall it may be convenient to first lay strips across the wall horizontally with motor 27 at the top near the ceiling and at the bottom neat or near the floor, this being accomplished by 1' st turning the applicator by means of the motor. 11 to stand with its discharge in a vertical or nearly vertical position. To lay tween horizontal ribbons such as beiiore mentioned the motor 27 is operated to shift applicator sidewise' the proper distance prev paratory to laying on the next vertical ribbon. if the next ribbon of plaster is to be a narrow one the motor 11 is additionally operated to obtain the necessary angularity of the nozzle and the speed of travel oi the applicator varied to meet the actual requirements as determined by observation ofthe operator. hen an area of wall within the limits of the plastering operations permitted by the normal swing of the horizontal lazy-tongs has been covered the pinion 56 is operated to shift the saddle to the extent necessary to cover another area adjoining that already covered. It will. be important to work the mortar as dry as possible so that upon application it will dry quickly and make a hard coat.

The machine can be operated by one skilled mechanic to set up the machine, adjust it and control the motors and one helper to keep the hopper supplied with mortar.

The forms and proportions of the parts can bechanged withoutdeparting from the gist of the invention as claimed.

lVhat, I claim is: a

1. A plasteringmachine including, in combination, a portable base, a column vertically movable on the base, a plaster" applicator having a swinging movement about an axis on the column and means whereby said axis can be shifted laterally with reference to the base. i V

2. A plastering machine comprising, in combination, a plaster applicator having an elongated discharge mouth, means forfeeding plaster to the applicator, means for moving the applicator adjacent the surface to be plastered and means tor adjusting and fixing said applicator to stand at dillerent angles to its path of movement.

3. A plastering machine comprising, in combination, a plasterapplicator having an elongated discharge mouth and a reciprocating plaster agitator at the discharge of said mouth, means for feeding plaster to the applicator, means for moving the applicator adjacent the surtaceto be plastered and means for adjusting and fixing said appliill) ing the plaster to the applicator, means .swivelly connecting the applicator to the means for feeding the plaster thereto, means for agitating the plaster at the discharge of the applicator and means for moving the applicator adjacent the surface to be plastered.

7. A plastering machine comprising, in combination, a plaster applicator having an elongated dischar e mouth means for feed-,

ing the plaster to the applicator, means for moring the applicator in fixed position back and forth adjacent the surface to be plastered and means for shifting the applicator laterally to travel adjacent parallel surfaces to be plastered.

8. A, plastering machine comprising, in combination, a plaster applicator having an elongated discharge mouth, means for feeding the plaster to the applicator, means for moving the applicator in fixed position back and forth adjacent the surface to be plastered to plaster surfaces in each direction of its movement and means for shifting the applicator laterally at the limit of its travel in each direction to travel adjacent parallel surfaces to be plastered.

9. A plastering machine comprising, in combination, a plaster applicator having an elongated discharge mouth, means for feeding the plaster to the applicator, means for moving the applicator in fixed position back and forth adjacent the surface to be plastered, means for swinging the applicator about an axis, means for causing the discharge mouth of the applicator to travel in a line lengthwise of its discharge when swung on said axis;

10. A plastering machine comprising, in combination, a plaster applicator having an elongated discharge mouth, means for feeding the plaster to the applicator, means for moving the applicator back and forth adjacent the surface to be plastered, means for adjusting the applicator about an axis and for fixing the same in the position to which adjusted, means for causing the discharge of the applicator to travel in a line lengthwise of its discharge when swung on said axis and means for moving the applicator transversely to the direction of the length of the discharge to apply plaster to the surface to be plastered.

11. A plastering; machine comprising, in combination, a plaster applicator and means for feeding plaster thereto, a lazy-tongs upon which said applicator is pivoted, a pivoting support for said lazy-tongs, means for swinging and extending and contracting said lazy-tongs and means between the lazytongs and the applicator for automatically swinging the applicator to maintain a plaster applying position when the lazy-tongs is swung.

12. A plastering machine comprising, in combination, a plaster applicator and means for feeding plaster thereto, a lazy-tongs upon which said applicator is pivoted, a pivoting support forsaid lazy-tongs, means for swinging and extending and contracting said lazy-tongs and gearing between the lazy-tongs and the applicator for automatically swinging the applicator to maintain a plaster applying position when the lazytongs is swung.

13. A plastering machine comprising, in combination, a plaster applicator and means for feeding plaster thereto, a columnar support and mover for said applicator including lazy-tongs and means for expanding and COHtliiCtll'lg said lazy-tongs.

l i. A plastering machine comprising, in combination, a plaster applicator and means for feeding plaster thereto, a columnar support and mover for said applicator including a plurality of lazy-tongs with rings uniting them and means for expanding and contracting said lazy-tongs.

15. A plastering machine comprising, in combination, a plaster applicator, an extensible frame with reference to which the applicator is pivotally mounted means for swinging the applicator with reference to said frame and guiding means for maintaining the discharge of the applicator in a plane parallel with the surface to be plastered.

16.A plastering machine including, in combination, a portable base, a column rotatably mounted and vertically movable on the base, a plaster applicator having a swinging movement about the axis of the column,and means whereby the column can be shi ted laterally on the base.

TllA'DDEUtS G. DUNLA 

